After a somewhat confoundly-sluggish stretch, monthly ebook sales collected by the AAP and IDPF from 12 publishers (thus dominated by the six largest trade publishers) have risen again–popping from $29.8 million in June to $40.8 million in July. That’s a new monthly highpoint, well surpassing the previous high of $31.9 million from January. (The month-by-month 2010 recap is below.) What could have changed so much in the marketplace in July? In the last week of June, Apple released iOS 4, extending the iBooks app and store to iPhones and iPod Touches (and they released the newest iPhone as well). But […]